/* ----------------------------------------------------------------------
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* $Date:        29. November 2010
* $Revision: 	V1.0.3
*
* Project: 	    CMSIS DSP Library
* Title:	    arm_sin_cos_example_f32.c
*
* Description:	Example code demonstrating sin and cos calculation of input signal.
*
* Target Processor: Cortex-M4/Cortex-M3
*
*
* Version 1.0.3 2010/11/29
*    Re-organized the CMSIS folders and updated documentation.
*
* Version 1.0.1 2010/10/05 KK
*    Production release and review comments incorporated.
*
* Version 1.0.0 2010/09/20 KK
*    Production release and review comments incorporated.
* ------------------------------------------------------------------- */

/**
 * @ingroup groupExamples
 */

/**
 * @defgroup SinCosExample SineCosine Example
 *
 * \par Description:
 * \par
 * Demonstrates the Pythagorean trignometric identity with the use of Cosine, Sine, Vector
 * Multiplication, and Vector Addition functions.
 *
 * \par Algorithm:
 * \par
 * Mathematically, the Pythagorean trignometric identity is defined by the following equation:
 *  <pre>sin(x) * sin(x) + cos(x) * cos(x) = 1</pre>
 * where \c x is the angle in radians.
 *
 * \par Block Diagram:
 * \par
 * \image html sinCos.gif
 *
 * \par Variables Description:
 * \par
 * \li \c testInput_f32 array of input angle in radians
 * \li \c testOutput stores sum of the squares of sine and cosine values of input angle
 *
 * \par CMSIS DSP Software Library Functions Used:
 * \par
 * - arm_cos_f32()
 * - arm_sin_f32()
 * - arm_mult_f32()
 * - arm_add_f32()
 *
 * <b> Refer  </b>
 * \link arm_sin_cos_example_f32.c \endlink
 *
 */


/** \example arm_sin_cos_example_f32.c
  */

#include <math.h>
#include "arm_math.h"

/* ----------------------------------------------------------------------
* Defines each of the tests performed
* ------------------------------------------------------------------- */
#define MAX_BLOCKSIZE	32
#define DELTA           (0.000001f)


/* ----------------------------------------------------------------------
* Test input data for Floating point sin_cos example for 32-blockSize
* Generated by the MATLAB randn() function
* ------------------------------------------------------------------- */

const float32_t testInput_f32[MAX_BLOCKSIZE] = {
	-1.244916875853235400,	-4.793533929171324800,	0.360705030233248850,	0.827929644170887320,	-3.299532218312426900,	3.427441903227623800,	3.422401784294607700,	-0.108308165334010680,
	    0.941943896490312180,	0.502609575000365850,	-0.537345278736373500,	2.088817392965764500,	-1.693168684143455700,	6.283185307179590700,	-0.392545884746175080,	0.327893095115825040,
	    3.070147440456292300,	0.170611405884662230,	-0.275275082396073010,	-2.395492805446796300,	0.847311163536506600,	-3.845517018083148800,	2.055818378415868300,	4.672594161978930800,
	    -1.990923030266425800,	2.469305197656249500,	3.609002606064021000,	-4.586736582331667500,	-4.147080139136136300,	1.643756718868359500,	-1.150866392366494800,	1.985805026477433800


    };

const float32_t testRefOutput_f32 = 1.000000000;

/* ----------------------------------------------------------------------
* Declare Global variables
* ------------------------------------------------------------------- */
uint32_t blockSize = 32;
float32_t  testOutput;
float32_t  cosOutput;
float32_t  sinOutput;
float32_t  cosSquareOutput;
float32_t  sinSquareOutput;

/* ----------------------------------------------------------------------
* Max magnitude FFT Bin test
* ------------------------------------------------------------------- */

arm_status status;

int32_t main(void)
{
	float32_t diff;
	uint32_t i;

	for(i = 0; i < blockSize; i++) {
		cosOutput = arm_cos_f32(testInput_f32[i]);
		sinOutput = arm_sin_f32(testInput_f32[i]);

		arm_mult_f32(&cosOutput, &cosOutput, &cosSquareOutput, 1);
		arm_mult_f32(&sinOutput, &sinOutput, &sinSquareOutput, 1);

		arm_add_f32(&cosSquareOutput, &sinSquareOutput, &testOutput, 1);

		/* absolute value of difference between ref and test */
		diff = fabsf(testRefOutput_f32 - testOutput);

		/* Comparison of sin_cos value with reference */
		if(diff > DELTA) {
			status = ARM_MATH_TEST_FAILURE;
		}

		if(status == ARM_MATH_TEST_FAILURE) {
			while(1);
		}

	}

	while(1);                             /* main function does not return */
}

/** \endlink */

